Mobile Communication System And Communication Method Thereof

1. A communication method in a mobile communication system that transmits different data over a plurality of paths between a mobile station and a base station, comprising: monitoring a communication state of each path between a mobile station and a base station by the base station; determining whether to transmit data over at least one of a plurality of paths or to transmit data over two or more paths of the plurality of paths, or to transmit data over only one path of the plurality of paths based on the communication state of each path and determining a path or paths used to transmit data; notifying the mobile station of the determined path or paths of the plurality of paths; and transmitting respective different data to which different transmission sequence numbers have been attached, over said notified path or paths between the mobile station and the base station.

2. A base station in a mobile communication system that transmits different data to which transmission sequence numbers have been attached, over a plurality of paths between a mobile station and a base station, comprising: a communication state monitoring unit that monitors a communication state of each path between a mobile station and a base station; a data transmission path notification unit that determines whether to transmit data over at least one of a plurality of paths or to transmit data over two or more paths of the plurality of paths, or to transmit data over only one path of the plurality of paths based on the communication state of each path, determines a path or paths of the plurality of paths used to transmit data and notifies the mobile station of the determined path or paths; and a processing unit that rearranges the different data received from said determined path or paths by reference to said transmission sequence numbers and transmits the rearranged data to a core network.

3. A mobile station in a mobile communication system that transmits different data over a plurality of paths between a mobile station and a base station, comprising: a list storage unit that receives and stores a correlation list from a base station that correlates path information that indicates which path or paths data is to be transmitted over, and an identifier that specifies that path information; a data transmission path receiving unit that receives an identifier from the base station that indicates which path or paths said data is to be transmitted over, and makes a reference to said correlation list to obtain the path or paths that correspond to the identifier; and a processing unit that transmits different data, to which different transmission sequence number have been attached, over the path or paths that correspond to said identifier.

4. A mobile communication system that transmits different data to which transmission sequence numbers have been attached, over a plurality of paths between a mobile station and a base station, wherein said base station comprises: a communication state monitoring unit that monitors a communication state of each path between a mobile station and a base station; a data transmission path notification unit that determines whether to transmit data over at least one of a plurality of paths or to transmit data over two or more paths of the plurality of paths, or to transmit data over only one path of the plurality of paths based on the communication state of each path, determines a path or paths of the plurality of paths used to transmit different data, and notifies the mobile station of the determined path or paths; and a processing unit that rearranges the different data received from said determined path or paths by reference to said transmission sequence numbers and transmits the rearranged data to a core network; and said mobile station comprises: a receiving unit that receives transmission path specification information from the base station that specifies which path or paths of the plurality of paths data is to be transmitted over; and a processing unit that transmits different data to which different transmission sequence numbers have been attached, over the specified path or paths.